|
|||||
|
|
| 锡铁山块状硫化物铅锌矿床成矿构造环境及矿区南部找矿潜力:来自滩间山群火山岩岩石化学、地球化学证据 | |
| 引用本文： | 孙华山,赵立军,吴冠斌,宁钧陶,陈巧妹,姜楚灵.锡铁山块状硫化物铅锌矿床成矿构造环境及矿区南部找矿潜力:来自滩间山群火山岩岩石化学、地球化学证据[J].岩石学报,2012,28(2):652-664. |
| 作者姓名： | 孙华山 赵立军 吴冠斌 宁钧陶 陈巧妹 姜楚灵 |
| 作者单位： | 1. 中国地质大学资源学院,武汉,430074 2. 中国地质大学图书馆,武汉,430074 3. 中国科学院地质与地球物理研究所,北京,100029 4. 湖南省地质矿产勘查开发局402队,长沙,410004 |
| 基金项目： | 本文受国家自然科学基金项目(41172087)和中央高校基本科研业务费专项资金项目(CUG090102)联合资助. |
| 摘 要： | 近年来海底块状硫化物矿床的深入研究表明,块状硫化物矿床形成与其成矿构造环境演化期间特定阶段的构造-火山作用有关,矿床持续形成时间一般不超过几个百万年。锡铁山矿床是我国西北地区最大的海底热液块状硫化物铅锌矿床,本文通过锡铁山矿床赋矿岩系火山岩岩石化学及地球化学特征的系统研究,对锡铁山矿床赋矿火山岩系岩浆演化过程及成矿构造环境得出如下几点认识:(1)锡铁山矿区赋矿滩间山群火山岩岩石化学及地球化学特征一致表明滩间山群岩浆活动具有自酸性向基性同源岩浆演化的特点。矿区滩间山群不同岩组/段的火山岩代表了同源岩浆不同演化阶段的产物。自O1-2tna-1岩段、O1-2tnb岩组→O1-2tnd-1岩段→O1-2tnd-3岩段,矿区火山岩岩石化学及稀土与微量元素地球化学具有明显的渐变过渡关系。(2)矿区滩间山群火山岩稀土、微量元素组成特征及成岩构造环境判别图解一致揭示,从O1-2tna-1岩段、O1-2tnb岩组→O1-2tnd-1岩段→O1-2tnd-3岩段,滩间山群火山岩成岩构造环境经历了从陆缘基底岛弧→洋陆过渡型地壳→典型大洋地壳的连续过渡变化。(3)矿区滩间山群火山岩岩浆演化过程及Rb、Sr组分变化趋势与大陆边缘弧后盆地火山岩岩浆演化过程相近,与现代西太平洋冲绳海槽形成过程相似。(4)综上推断,矿区深部及外围找矿工作的重点对象是弧后盆地拉张早期形成的具有双峰式火山岩组合的下部火山-沉积组合,而矿区南部O1-2tnd岩组找寻同类矿床的可能性不大。 |
| 关 键 词： | 成矿构造环境 找矿指示 块状硫化物矿床 锡铁山 |
| 收稿时间： | 2011/8/11 0:00:00 |
| 修稿时间： | 2011/10/27 0:00:00 |
Metallogenic tectonic setting and ore-finding potential of Xitieshan massive sulfide lead-zinc deposit: Evidence from lithochemistry and geochemistry of ore-hosted volcanic strata, Tanjianshan Group |
|
| SUN HuaShan,ZHAO LiJun,WU GuanBin,NING JunTao,CHEN QiaoMei and JIANG ChuLing.Metallogenic tectonic setting and ore-finding potential of Xitieshan massive sulfide lead-zinc deposit: Evidence from lithochemistry and geochemistry of ore-hosted volcanic strata, Tanjianshan Group[J].Acta Petrologica Sinica,2012,28(2):652-664. | |
| Authors: | SUN HuaShan ZHAO LiJun WU GuanBin NING JunTao CHEN QiaoMei and JIANG ChuLing |
| Institution: | Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;Library, China University of Geosciences, Wuhan 430074, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;402 Geological Team of Geology and Mineral Resources Development Bureau, Hunan Province, Changsha 410004, China;Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China |
| Abstract: | Recent research of submarine massive sulfide deposit (MSD) showed that the MSD generation was closely related to some processes of tectonic structure and volcanism, which occurred in a special period of tectonic evolution and generally ore-forming time-span within several million years. The Xitieshan deposit, located in the northern margin of the Qaidam basin, Qinghai Province, is the largest MSD in the northwest of China. Based on systematic petrochemical and geochemical research of ore-hosting volcanic rocks, named the Tanjianshan Group, it can be stated that, (1) petrochemistry and geochemistry of volcanic rocks of the Tanjianshan Group indicate that the magmas were originated from an identical source, evolving from acidic to mafic and thus generating various volcanic rocks with a transitional petrochemical and geochemical trend. (2) Attributes of REE and trace elements, and tectonic discrimination diagrams collectively display that the tectonic settings for generating the Tanjianshan Group volcanic had been evolved continuously from continental magmatic arc, through transitional arc, to oceanic basin. (3) The magma evolution and Rb-Sr isotope systematics imply that the tectonic setting of the Xitieshan MSD might be a continental back-arc basin similar to Okinawa tough in the southwest Pacific. (4) As to the mineral prediction, it is concluded that, the volcanic-sedimentary successions within the bimodal volcanic sequence formed during the early back-arc extension, are believed to be the important target in the Xitieshan orefield and its vicinities, but the upper stratigraphic successions of the Tanjianshan Group are not favorable in finding MSD mineralization. |
| Keywords: | Metallogenic tectonic setting Ore-finding significance Massive sulfide deposit Xitieshan |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《岩石学报》浏览原始摘要信息 | |
| 点击此处可从《岩石学报》下载免费的PDF全文 | |